JP4208062B2 - Slip detection reinforcement pile for earth structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slip detection / reinforcement pile for an earth structure such as a natural ground or embankment, which is used for an optical fiber sensor system.
[0002]
[Prior art]
Conventionally, as a sensor to detect the deformation of earth structures such as natural ground and embankment,
(1) There are sensors such as a strain gauge and a landslide meter attached to a long member, and these measure points.
[0003]
(2) Currently, the optical fiber sensor is used as a method for measuring distortion of a concrete member or deformation on the surface of the embankment.
[0004]
[Problems to be solved by the invention]
However, in the point-to-point measurement of the conventional technique (1) described above, measurement points are independent at each point, and it has not been possible to continuously measure several tens of kilometers.
[0005]
Moreover, although the optical fiber sensor of the above-mentioned conventional technique (2) is used as a deformation measurement technique on the surface of a concrete member such as distortion or embankment, in order to measure detailed deformation in the ground. Is currently not used.
[0006]
Under these circumstances, the present inventor has proposed underground fiber optic sensor and its fiber optic sensor system can measure detailed Deformation in underground as already JP Application 2 000-31372.
[0007]
In view of the above situation, an object of the present invention is to provide a slip detection / reinforcement pile for an earth structure that can reinforce the earth structure and simultaneously perform deformation management of the earth structure thereafter. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides
[1] In a slip detection / reinforcement pile for earth structure, the main body is driven from the side surface of the earth structure, and an optical fiber is folded and attached to the inner space of the main body, and the optical fiber is spaced from the inner surface of the main body. is by Ri fixed to the adhesive resin Oite punctate, the optical fiber in the doorway of the inner hollow portion of said body, characterized by comprising an optical fiber sensor which is fixed by an adhesive resin.
[0009]
[2] The slip detection and reinforcement pile for earth structure according to [1], wherein the main body is a high-rigidity tubular pile.
[0010]
[3] The slip detection / reinforcement pile for earth structure according to [1] or [2], wherein a drainage hole is formed in the main body.
[0011]
[4] In the slip detection reinforcing pile for earth structure according to the above [1] or [2], construction is performed by inclining the tip of the reinforcement pile upward and the pile head downward from the side of the earth structure. It is characterized by doing.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
[0013]
FIG. 1 is a schematic diagram showing the construction of a slip detection reinforcing pile for an earth structure using an underground optical fiber sensor system according to an embodiment of the present invention.
[0014]
As shown in FIG. 1, a slip detection reinforcing pile 2 for a soil structure having a function of an optical fiber sensor is applied to a natural mountain or a track area 1 that has been embanked.
[0015]
In this slip detection reinforcing pile 2 for earth structure, an optical fiber 4 is mounted inside a highly rigid tubular pile body 3 such as a steel pipe or an FRP pipe.
[0016]
The slip detection reinforcing pile 2 for the earth structure is driven so as to be tilted from the side surface of the ground mountain or the embankment of the track area 1 so that the tip 2A of the reinforcing pile 2 is upward and the pile head 2B is downward. .
[0017]
Hereinafter, specific examples of the slip detection / reinforcement pile for the earth structure will be shown.
[0018]
FIG. 2 is a view showing the structure of a slip detection / reinforcement pile for earth structure according to the first embodiment of the present invention, and FIG. 3 is an enlarged view showing a fixed state of the optical fiber.
[0019]
In these drawings, 10 is a slip detection reinforcing pile for earth structure, and an inner space portion 12 is formed in the high-rigidity tubular pile body 11, and an optical fiber 13 is installed inside the inner space portion 12, The predetermined position is fixed in a dot shape by the adhesive resin 14. The tip of the high-rigidity tubular pile body has an acute angle so that it can be easily placed. At the outlet of the inner space portion of the high-rigidity tubular pile body 11, it is securely fixed by the adhesive resin 14 'so that the optical fiber 13 is not rubbed and damaged at the inlet / outlet of the inner space portion of the high-rigidity tubular pile body 11. To do.
[0020]
Further, as shown in FIG. 4, the optical fiber 13 is fixed to the inner space portion 12 of the high rigidity tubular pile body 11 by mounting the optical fiber 13 in the inner space portion 12. An adhesive resin 16 may be applied to the entire surface of the part to fix the optical fiber 13 as a whole. Again, care should be taken that the optical fiber 13 is not rubbed and damaged at the entrance of the inner space of the high-rigidity tubular pile body 11.
[0021]
Also, the adhesive resin 16 ′ is extended to the entrance and exit of the inner space portion of the high-rigidity tubular pile body 11, and the optical fiber 13 is fixed to the inner space portion of the high-rigidity tubular pile body 11 by being surely fixed at the exit of the inner space portion. Be careful not to be rubbed and damaged at the outlet.
[0022]
Moreover, you may make it mount | wear with the cap 15 which consists of elastic materials at the entrance and exit of the inner space part of the highly rigid tubular pile main body of an optical fiber.
[0023]
FIG. 5 is a view showing the structure of a slip detection / reinforcement pile for earth structure according to a second embodiment of the present invention.
[0024]
In this figure, reference numeral 20 denotes a slip detection / reinforcement pile for an earth structure, and the slip detection / reinforcement pile 20 for an earth structure has an inner space portion 22 formed in the high-rigidity tubular pile body 21, and the inner space portion thereof. An optical fiber 23 is installed inside 22 so that a predetermined position is fixed in a dot shape by an adhesive resin 24. Furthermore, in this embodiment, the drainage hole 25 is formed in the high-rigidity tubular pile body 21 so that the water permeability is good.
[0025]
In particular, in the case of this kind of slip detection reinforcing pile 20 for earth structure, as shown in FIG. 1, the tip 20A of the reinforcing pile 20 is piled upward from the side surface of the ground area or the embankment of the track area 1. It is preferable that the head 20 </ b> B is inclined and driven so that the water that has entered the inside of the high-rigidity tubular pile main body 21 from the ground is guided downward through the drainage hole 25 and has high rigidity. Since it is discharged | emitted from the rear end (entrance / exit) of the tubular pile main body 21, it is preferable as a reinforcing material.
[0026]
FIG. 6 is a view showing the structure of a slip detection / reinforcement pile for earth structure according to a third embodiment of the present invention.
[0027]
In this embodiment, the optical fiber 32 is wound around the outer surface of the main body 31 of the solid soil structure slip detection reinforcing pile 30 and the outer surface is coated with the resin 33.
[0028]
By doing in this way, while simplifying the structure of the slip detection reinforcement pile for earth structures, mounting | wearing of an optical fiber is also easy. The optical fiber can be protected by a resin.
[0029]
Hereinafter, an optical fiber sensor system using the above-described slip detection reinforcing pile for earth structure will be described with reference to FIG.
[0030]
The slip detection / reinforcement pile 2 for the earth structure is driven with the tip inclined upward from the side surface of the track area 1 where the earth is piled or embanked, and the optical fiber 4 is laid. In that case, a reference optical fiber 5 is arranged.
[0031]
Therefore, light is introduced from the light source 6 through the first optical coupler 4a to the optical fiber 5 serving as a reference and the optical fiber 4 disposed in the ground or the embankment of the orbital area 1, and light is transmitted to both the optical fiber 5 and the optical fiber 4. The optical waveguide state is converted into electricity by the O / E (optical / electrical converter) 7 through the second optical coupler 4b, demodulated by the passive homodyne demodulator 8, and measured by the measuring device 9. The electrical output status from the optical fibers 4 and 5 is monitored.
[0032]
Therefore, for example, when the deformation has occurred inside the natural ground or embankment, the path of the optical fiber 4 changes. That is, the slip detection reinforcing pile 2 for the earth structure is displaced. Then, the waveguide state of light in the optical fiber 4 changes, and a deviation occurs when compared with the waveguide state of light in the optical fiber 5 serving as a reference. The deviation can be measured by the measuring device 9. it can.
[0033]
In addition, in the case where a destructive deformation occurs in the ground or embankment where the above-described slip detection reinforcing pile 2 for earth structure has been driven, a large change will occur in the optical fiber 4 as well. When the optical waveguide 5 serving as a reference is significantly different from the light waveguide state, an alarm device 9A linked to the measuring device 9 may issue an alarm. A modulation signal generator 8A is provided between the light source (laser light source) 6 and the passive homodyne demodulator 8.
[0034]
Depending on how the structure of the optical fiber sensor is to be monitored, the arrangement of various optical fiber sensors can be selected.
[0035]
Moreover, measurement can be performed for several tens of kilometers or more, and centralized management is possible at a remote place.
[0036]
In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.
[0037]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
[0038]
(A) While reinforcing earth structures, such as a natural ground and embankment, the deformation management of the earth structure of a natural ground and embankment after that can be performed simultaneously.
[0039]
(B) Since the optical cable is fixed to the inner space of the high-rigidity tubular pile body, the construction of the optical cable sensor is easy.
[0040]
(C) Since the fixing at the entrance / exit of the inner space of the highly rigid tubular pile body of the optical cable is ensured, the optical cable can be prevented from being damaged.
[0041]
(D) A high-rigidity tubular pile is driven from the ground by inclining so that the tip of the reinforcing pile is upward and the pile head is downward from the side surface of the ground or embankment of the track area. The water that has entered the inside of the pile main body is preferable as a reinforcing material because it is guided downward through the drain hole and discharged to the outside of the earth structure.
[Brief description of the drawings]
FIG. 1 is a schematic view showing the construction of a slip detection reinforcing pile for earth structure using an underground optical fiber sensor system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a structure of a slip detection / reinforcement pile for earth structure according to a first embodiment of the present invention.
FIG. 3 is an enlarged view (No. 1) showing a fixed state of the optical fiber of the slip detection and reinforcement pile for earth structure according to the first embodiment of the present invention.
FIG. 4 is an enlarged view (No. 2) showing a fixed state of the optical fiber of the slip detection reinforcing pile for earth structure according to the first embodiment of the present invention.
FIG. 5 is a diagram showing a structure of a slip detection / reinforcement pile for earth structure according to a second embodiment of the present invention.
FIG. 6 is a view showing a structure of a slip detection / reinforcement pile for earth structure according to a third embodiment of the present invention.
[Explanation of symbols]
1 Natural ground and embanked track area 2,10,20,30 Slip detection reinforcement pile for earth structure 2A, 20A Tip of slip detection reinforcement pile for earth structure 2B, 20B Pile of slip detection reinforcement pile for earth structure Head 3,11,21,31 High rigidity tubular pile body 4,4 ', 13,13', 23,23 ', 32 Optical fiber 4a First optical coupler 4b Second optical coupler 5 Reference optical fiber 6 Light source 7 O / E (optical / electrical converter)
8 Passive homodyne demodulator 8A Modulation signal generator 9 Measuring device 9A Alarm device 12, 22 Internal space 14, 14 ', 16, 16', 24 Adhesive resin 15 Cap 25 Water drain hole 33 Resin

Claims (4)

With the body is driven from the side of the soil structure, the main body fiber to the hollow portion is mounted folded in, the optical fiber is by Ri fixed to the adhesive resin at intervals in dots on an inner surface of said body , the hollow portion and the optical fiber Earth structure for slip detection reinforcing piles, characterized by comprising an optical fiber sensor which is fixed by an adhesive resin at the entrance of the body.   The slip detection / reinforcement pile for earth structures according to claim 1, wherein the main body is a high-rigidity tubular pile.   The slip detection / reinforcement pile for earth structure according to claim 1 or 2, wherein a drainage hole is formed in the main body.   The slip detection reinforcing pile for earth structure according to claim 1 or 2, wherein the construction is performed by inclining the tip of the reinforcing pile upward from the side of the earth structure so that the pile head is downward. Slip detection reinforcement pile for earth structures.

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